Access to XMLHttpRequest at ‘file:///D:/users‘ from origin ‘null‘ has been blocked by CORS policy: C这是跨域了，参考这篇 什么是跨域，跨域异常怎么解决版权声明：本文为Sai_BAN原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。原文链接：https://blog.csdn.net/Sai_BAN/article/details/116451781